I am currently using a pair of CBS Hytrons which sound nice. I hav eused Sylvanias and Tung Sols with great success. I have also found that I can achieve some nice improvements by changing the 6CA4. I am currently using a Mullard Branded as an Amperex EZ81 in place of the stock tube. I have never heard the EH, prefering to use NOS whenever possible over anything from EH. Moral to the story is experiment to tailor the sound to your musical tastes.
